Watchmaker s tool



(No Model.)

A. P. ROBBINS.' WATGHMAKERS TO0L.`

Patented Jan. 19, 1897.

T//A r UNiTED STATES PATENT OFFICE.

ALBERT F. ROBBINS, OF ORANGE, MASSACHUSETTS, ASSIGNOR OF ONE- HALF TOKENDRIOK da DAVIS, OF LEBANON, NEW HAMPSHIRE.

WATCHMAKERS TOOL.

SPECIFICATION forming part of Letters Patent No. 575,535, dated January19, 1897. Application filed June 25, 1896. Serial No. 596,869- (Nomodel.\

To all whom t may concern.-

Be it known that I, ALBERT F. RoBBINs, a citizen of the United States ofAm erica, residing at Orange, in the county of Franklin and State ofMassachusetts, have invented new and useful Improvements in VVatchmakersTools, of which the following is a specification.

This invention relates to watchmakers tools, and more particularly to amachine for truing and burnishing the pivots of balancewheels of watchesor analogous parts of other mechanisms; and the invention consists inthe construction and arrangement of the mechanism, as hereinafter setforth and claimed.

In the drawings forming part of this specification, Figure l is asectional elevation of a machine constructed according to my invention.Fig. 2 is a sectional elevation of a portion of the standard of themachine, taken in a plane at right angles to that shown in Fig. 1. Fig.3 is a view of the inner side of the face-plate, showing the eccentricpawl therein. Fig. 4 is a view of the outer side of the face-plate, apart of the standard ofthe machine, showing a balance-wheel in positionon said face-plate.

In the drawings, A is a standard made of metal and having a broad basethereon, as shown. Said standard is circular in crosssection and isprovided with the passage B, running centrally therethrough,perpendicularly. The walls of the standard are perforated transverselyat O. Into said perforation in one wall of said standard is inserted thebushing 2, which is secured therein by two screws 3 or in any othersuitable manner. Said bushing is screw-threaded interiorly for thereception of a threaded hollow spindle 4, one end 5 of which is taperedand split by sawing, as at 6, and a tapered nut 7 screws onto saidtapered and split end, constituting a chuck forholding the rod 8 locatedwithin said hollow spindle. A check-nut 9 on said spindle serves to holdthe latter in its proper position by being screwed up thereon againstthe outer end of said bushing 2, between it and said nut 7, all clearlyshown in Fig. 1. The end of said hollow spindle opposite the tapered endthereof is provided with an outwardly-turned iiange 10.

A face-plate 11, made of sufficient weight to serve as a balance-wheel,is perforated centrally for the reception of said hollow spindle,andxthe outer end of said perforation counterbored for the reception ofsaid anged end thereof. Said spindle is held rigidly in a horizontalposition by the check-nut thereon, as described, and the said face-plateturns freely thereon. Between the inner side of said face-plate 11 andthe inner end of said bushing 2 there is located a pawl-disk l2, havinga longsleeve 13 thereon, and the said hollow spindle is so adjusted thatthe said face-plate and said pawl-disk and sleeve may be freely rotatedthereon without binding. A pin 14 projects from the face of the saidpawldisk, on which is hung the eccentric pawl 15, the inner side of thesaid face-plate having the annular depression 16 therein of about thesame depth as the thickness of the said pawl 15, to the end that the twocontiguous surfaces of the said face-plate and pawl-disk may lie inclose proximity to each other, inclosing said pawl between them.

Motion is imparted to the various rotating parts of the mechanism asfollows: On the sleeve 13 of the pawl-disk 12 suitable teeth 17 are cutfor engagement with the rack 17, which has a movement vertically in thepassage B of the standard. Said rack is secured by each end thereof tocylindrical blocks 18 and 19, near the edge of said blocks, as shown inFig. 2. Secured centrally to the block 18 is 'a push-rod 20, having anenlargement on the upper end thereof for the finger of the operator.Said rod 2O has a groove 21 cnt therein, with which engages the screw 22in the bushing 3. Said bushing is secured within the passage B at thetop thereof by a setscrew, as shown in Fig. 1, and the said pushrodhas afree movement therethrough. Under the block 19, at the lower extremityof the said rack and within the said passage B, is

located a spiral spring 24, the upper end ofl which bears against theunder side of the said block and the lower end of which is supported bythe shoulder 25 within said vertical passage. The vertical movements ofsaid rack imparted thereto by the operator i'n one direction cause therotation of the pawl-disk, the l pawl 15 of which engages the edge ofthe de- IOO pression 1G, as aforesaid, only on the down ward movement ofthe said rack. On the upward movement thereof the pawl moves around insaid depression 1G without engagement with the edge thereof. A bracketconsisting of the arms 2G and 27 is secured to the standard below thesaid spindle 4 and verti` eallyin line therewith. Said bracket may beswung to one side, as shown in Fig. 2, for the removal or adjustment ofthe parts in the standard A. Through the upper end of arm 27, andcentrally in line with the spindle 4, a hole is drilled and threaded,into which is screwed a split sleeve 2S, tapered on one end, and ontowhich end a similarly-tapered nut is screwed to clamp thebalance-wheel-staff support 20. Said support is made of a piece ofsuitable round rod with one end thereof milled oli" to a properthickness and the end then turned up at right angles to the axis of therod and a hole drilled through said turnedup end for the reception ofthe end of the balance-wheel pivot which is to be trued up or burnished,all clearly shown in Figs. 1 and 4. The opposite end of said staff isentered in a suitable hole drilled into the end of the rod S within thespindle 4. Said rods 29 and S may be reversed, if desired, and 2S) beinserted in the hollow spindle and S be supported in arm 27. On theouter side of the faeeeplate is secured a pin 30 for engagement with oneof the arms of the balance-wheel of a watch which may7 be put on themachine for repairs of the staff thereof. (See Fig. 4.) In operatingthis device the nut is unscrewed from the sleeve 28, and the rod orsupport 25), thereby loosened, can be withdrawn far enough to permit oneend of the balancewheel staff to be entered into the hole in the end ofthe rod 8. The rod 20 is then moved toward the free end of the saidstati and the latter is passed through the hole made to receive it inthe upturned end thereof. The check-nut on 2S is then screwed up andsaid rod held against any movement. The finger of the operator is thenpressed on the top of the push-rod and the latter moved down, revolvingthe pawl-disk 12 by means oi the engagement of rack 17 with the teeth 17on the sleeve 13 of said pawl-disk. The said revolution of the pawl-diskimparts motion to the face-plate 11 by the engagement of the pawl15 withthe edge of the depression 1G in the inner side of said face-plate 11,and by the revolution of said faceplate the balance-wheel is revolved bythe engagement of the pin SO on said face-plate with one of the arms ofsaid wheel, as described. The said rods S and 29 support saidbalance-wheel by the engagement of each end of its staff there with, theend of the pivot projecting through the upturned end of the rod 29 beingthe one to be turned true or burnished, as above described. Uponrelieving the said push-rod from the pressure of the linger the spring24., having been compressed by the downward movement of said push-rod,acts to return said rod vertically to its normal position, impartingmovement in an inverse direction to the pawl-disk and its sleeve, thepawl carried by the pawl-disk not engaging with the faceplate when sorevolved. During such return movement of the rack and push-rod, causedby thespring 24, the face-plate, owing to its weight, continues torevolve under the impulse given to it by the downward movement of thepush-rod, so that while the pawl-disl has a reciprocatory motion on thehollow spindle the face-plaie carrying the balancewheel to be operatedupon revolves only in one direction, as above stated.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

1. The within described mechanism for turning the staffs of balancewheels 'for watches or analogous parts, consisting of a suitablestandard, two adjustable members supported therein for revolubly holding a balance-wheel or other work, a hollow spindle within which one ofsaid members is located, a face-plate which has an engagement with saidbalance-wheel or other work, a revoluble member on said hollow spindlerotated by a vertically-moving member, and means between said revolublemember and said faceplate Jfor rotating the latter in one direction,only, substantially as described.

2. The within described mechanism for turning the staffs of balancewheels for watches or analogous parts, consisting of a suitablestandard, a rack having a verticallyreciprocating movement therein, ahollow spindle supported in a position at right angles to said rack, apawldisk having a long sleeve thereon, on which teeth are provided forengagement with said rack, a pawl on said pawl-disk engaging with aface-plate for rotating the latter in one direction only on said hollowspindle, means for holding thc staff of said balance-wheel in lineaxially with said hollow spindle, and means of engagement between saidfaee-plate and said balance-wheel for rotating the latter, substantiallyas described.

ALBERT F. ROBBINS.

lVitnesscs:

ANDREW J. HAMILTON, MINNIE R. PIT'rs.

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